The cooling medium, or coolant, in them is either water or some low-freezingliquid, called antifreeze.
冷却媒介或者散热剂，包括冷却水和一些防冻液，被称为冷却液。
2
The brittleness of high-manganese steel under low temperature is discussed. A method of Iow-temperature cutting with liquid nitrogen freezing of the workpiece has been developed.